title: Spatial mapping of efficiency of GaN/InGaN nanowire array solar cells using scanning photocurrent microscopy.
abstract: GaN-InGaN core-shell nanowire array devices are characterized by spectrally resolved scanning photocurrent microscopy (SPCM). The spatially resolved external quantum efficiency is correlated with structure and composition inferred from atomic force microscope (AFM) topography, scanning transmission electron microscope (STEM) imaging, Raman microspectroscopy, and scanning photocurrent microscopy (SPCM) maps of the effective absorption edge. The experimental analyses are coupled with finite difference time domain simulations to provide mechanistic understanding of spatial variations in carrier generation and collection, which is essential to the development of heterogeneous novel architecture solar cell devices.
authors.affiliation: Department of Materials Science and Engineering, Northwestern University , 2220 Campus Dr., Evanston, Illinois 60208, United States.
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Howell
authors.forename: Sonal
authors.initials: S
authors.lastname: Padalkar
authors.forename: KunHo
authors.initials: K
authors.lastname: Yoon
authors.forename: Qiming
authors.initials: Q
authors.lastname: Li
authors.forename: Daniel D
authors.initials: DD
authors.lastname: Koleske
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Wierer
authors.forename: George T
authors.initials: GT
authors.lastname: Wang
authors.forename: Lincoln J
authors.initials: LJ
authors.lastname: Lauhon